“In The Flesh?” There is no better way to open a rock concert. I hadn’t listened to The Wall in quite some time, so it hit me like a ton of stark white concrete blocks. As it built to its bombastic climax, it wasn’t the blistering pyrotechnics that blew my mind so much as the heightened awareness of what we were all about to experience, all that anticipation bottled in three ominous minutes of proto-doom metal, the onset of an experience you almost need to have to get a grasp of where modern music came from. The madness of Roger Waters may be tempered by decades of adulation, but the enduring relevance of the songs can’t be dampened; they’re about our world, today just as much as any previous day.